Lines Matching +full:tx +full:- +full:dma +full:- +full:channel

2 # SPDX-License-Identifier: Apache-2.0
5   STM32 DMA controller (V1)
8   This DMA controller includes FIFO control registers.
9   DMA clients connected to the STM32 DMA controller must use the format
10   described in the dma.txt file, using a four-cell specifier for each
11   channel: a phandle to the DMA controller plus the following four integer cells:
12     1. channel: the dma stream from 0 to <dma-requests>
13     2. slot: DMA periph request ID, which is written in the DMAREQ_ID of the DMAMUX_CxCR
14     this value is 0 for Memory-to-memory transfers
15     or a value between <1> .. <dma-generators> (not supported yet)
16     or a value between <dma-generators>+1  ..  <dma-generators>+<dma-requests>
17     3. channel-config: A 32bit mask specifying the DMA channel configuration
19         -bit 6-7 : Direction  (see dma.h)
24         -bit 9 : Peripheral Increment Address
27         -bit 10 : Memory Increment Address
30         -bit 11-12 : Peripheral data size
32                0x1: STM32_DMA_PERIPH_16BITS: Half-word (16 bits)
35         -bit 13-14 : Memory data size
37                0x1: STM32_DMA_MEM_16BITS: Half-word (16 bits)
40         -bit 15: Peripheral Increment Offset Size
42                0x1: STM32_DMA_OFFSET_FIXED_4: offset size is fixed to 4 (32-bit alignment)
43         -bit 16-17 : Priority level
48     4. features: A 32bit bitfield value specifying DMA features
49         -bit 0-1: DMA FIFO threshold selection
55   Example of dma usual combination for peripheral transfer
60      dma2: dma-controller@40020400 {
61          compatible = "st,stm32-dma-v1";
64          dma-requests = <7>;
69     Tx using stream 5 on channel 3 (stream 2 on channel 2 is also possible)
70     Rx using stream 2 on channel 3 (stream 0 on channel 3 is also possible)
74      dma-names = "tx", "rx";
77 compatible: "st,stm32-dma-v1"
79 include: st,stm32-dma.yaml
82   "#dma-cells":
85 # Parameter syntax of stm32 follows the dma client dts syntax
87 …nel.org/pub/scm/linux/kernel/git/devicetree/devicetree-rebasing.git/plain/Bindings/dma/st,stm32-dm…
89 dma-cells:
90   - channel
91   - slot
92   - channel-config
93   - features